Brown the meatballs in the pan, turning them often to prevent burning. Next, add the mushrooms and gravy. I used the Heinz mushroom gravy, but feel free to use any flavor you like. I am sure they will all taste great. The gravy really makes the meatballs have a moist, decadent texture. Stir the meatballs, so they are evenly coated. Cover and let simmer for about 20 minutes. The mushrooms will cook down and reduce. As turkey is part of the poultry family, it is very important that the meatballs are fully cooked before serving. Serve the mixture over whole wheat noodles or brown rice.